Hello, thank you for reaching out to Microsoft Q&A.
If you exceed your OneDrive storage limit, your account will be placed in a frozen state, and you will no longer be able to send or receive emails normally.
If you free up space or upgrade the storage on your account, it usually takes about 2–4 hours for the increased storage to be reflected in your account, and 24–48 hours for your account to be fully unfrozen.
You can check whether your subscription is active in your Microsoft account by signing in to the Services & Subscriptions page here:
https://account.microsoft.com/services
If your subscription is active, wait 2-4 hours and then visit the OneDrive storage settings page to see if your storage is updated in your account.
https://outlook.live.com/mail/0/options/accounts-category/storage
Open an incognito tab and sign in with your account on the link above.
Try sending an email after 24 hours.
Let me know if you still need more help.